US4681491A - Milling machine - Google Patents

Milling machine Download PDF

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Publication number
US4681491A
US4681491A US06/662,352 US66235284A US4681491A US 4681491 A US4681491 A US 4681491A US 66235284 A US66235284 A US 66235284A US 4681491 A US4681491 A US 4681491A
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US
United States
Prior art keywords
milling
slide
units
bearing brackets
workpiece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/662,352
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English (en)
Inventor
Gottfried Blaimschein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gfm Gesellschaft fur Fertigungstechnik und Maschinenbau GmbH
GFM GESELLSCHAFT
Original Assignee
GFM GESELLSCHAFT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GFM GESELLSCHAFT filed Critical GFM GESELLSCHAFT
Assigned to GFM GESELLSCHAFT FUR FERTIGUNGSTECHNIK UND MASCHINENBAU GESELLSCHAFT M.B.H. reassignment GFM GESELLSCHAFT FUR FERTIGUNGSTECHNIK UND MASCHINENBAU GESELLSCHAFT M.B.H. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BLAIMSCHEIN, GOTTFRIED
Application granted granted Critical
Publication of US4681491A publication Critical patent/US4681491A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/06—Milling crankshafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/50—Cutting inserts
    • B23C2210/503—Cutting inserts mounted internally on the cutter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2220/00—Details of milling processes
    • B23C2220/68—Whirling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/306664—Milling including means to infeed rotary cutter toward work
    • Y10T409/30756—Machining arcuate surface
    • Y10T409/307616—Machining arcuate surface with means to move cutter eccentrically
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/19—Lathe for crank or crank pin

Definitions

  • This invention relates to a milling machine for machining crankshafts and similar workpieces, comprising milling units adapted to perform a feeding movement in a plane that is normal to the axis of the workpiece for machining the workpiece to form circular cross-sections which are concentric or eccentric to the axis of the workpiece, and a back rest for supporting the workpiece between the milling units in addition to the support of the workpiece at its ends, each of which milling units comprising a tool drum, adapted to be driven and to accommodate internally cutting annular inserted-tooth cutters.
  • Milling machines comprising two milling units and single or multiple inserted-tooth cutters as milling tools are used in the mass production of crankshafts or camshafts and similar workpieces and permit the workpieces to be machined within a short time because a plurality of cross-sections are machined at the same time. But in that case the workpiece is rather unstable and a machining to the desired accuracy will not be possible unless the workpiece which is gripped at its ends is additionally supported between its ends. Such an intermediate support of the workpiece gives rise to difficulties in internal milling operations, which are preferable to external milling operations because the edge life is longer and a better finish is obtained.
  • the slides required for the respective milling units must be provided with driving and control means operative in the direction of five or six coordinate axes, depending on whether the workpiece rotates or is at a standstill, and the axial displacement of the milling units involves a considerable increase of the nonproductive times so that the total machining time is increased; this is most undesirable.
  • crankshaft milling machine which is of the kind described first hereinbefore but has a comparatively simple overall concept and permits the machining times to be minimized.
  • This object is accomplished in accordance with the invention by mounting at least two and preferably all milling units on a common milling slide, which is adapted to perform the feed movement, while leaving a free space for a back rest between adjacent milling units.
  • the milling units mounted on a common milling slide can no longer be used independently of each other but will always perform the same feed movement, the fact that the same drive means and control means are associated with all milling units substantially improves the economy of the machine.
  • the workpieces to be machined are always identical so that the milling units are used in any case in the same relation to each other and the fact that they cannot be operated independently of each other is no disadvantage.
  • the free space formed by a recess in the common milling slide between the adjacent milling units permits a mounting of a back rest for supporting the workpiece intermediate its ends so that the workpiece can be machined in a single gripped position at all cross-sections at which the workpiece can be machined by means of milling units or inserted-tooth cutters which perform the same feed movements.
  • the milling machine is simple in structure and its milling slide is associated with driving and control means acting in the direction of only two rather than five or six coordinate axes and can be used for the simultaneous machining of crankshafts at all mainshaft portions and end flanges by means of tool drums which are coaxial to each other and carry suitable inserted-tooth cutters.
  • the tool drums may be so disposed that their axes are offset from each other.
  • the milling slide will consist of a compound slide and the position of the drum axes relative to each other must be in accordance with the center spacing and angular position of the cross-sections which are to be machined and which are to be aligned with the milling units.
  • the drive and control means need to act only in the directions of two coordinate axes and nevertheless all crankpins can be machined at the same time.
  • the milling units are mounted on the milling slide so as to be adjustable relative to each other.
  • one and the same milling machine may be used in an advantageous manner to machine workpieces which differ in dimensions and design.
  • the adjustment may be provided in an axial, vertical or horizontal direction, and a combined adjustment may be provided where a universal application is desired.
  • the milling units can be adjusted in view of different eccentricities, center spacings and angular misalignments.
  • the milling slide carries a separate bearing bracket for each milling unit and said bearing brackets are axially spaced apart and protrude freely from that side of the slide which faces the workpiece.
  • Such bearing brackets provide a stable support for each milling unit and there is adequate space for the back rests between the bearing brackets.
  • the bearing brackets are mounted on a milling slide which consists of a compound slide, the workpiece must be rotated as it is machined and the machining operations which can be performed are restricted.
  • the milling slide consists of a cross-slide and a vertically movable lifting slide, which surrounds a guide column of the cross slide and carries the bearing brackets for mounting the milling units.
  • the cross slide and the lifting slide constitute, in combination, a simple compound slide which may be used to impart a revolving feed movement to the milling units so that the workpiece need not be driven as it is machined at its crankpins and mainshaft portions.
  • At least one of the bearing brackets may consist of a mounting slide, which is adjustable relative to the lifting slide. In that case the desired movement of the milling units relative to each other and relative to the milling slide can be imparted to the milling units without need for an additional structural expenditure.
  • FIGS. 1 and 2 are, respectively, an end elevation, in which the front gripping head has been omitted, and a top plan view, partly in section, showing a first illustrative embodiment of a milling machine in accordance with the invention.
  • FIG. 3 is a top plan view showing, partly in section, a milling machine which is slightly modified from the first embodiment.
  • FIGS. 4 and 5 are, respectively, an end elevation, in which the front gripping head has been omitted, and a top plan view, partly in section, showing a second illustrative embodiment of a milling machine in accordance with the invention.
  • FIGS. 6 and 7 are respectively, an end elevation, in which the front gripping head has been omitted, and a top plan view, partly in section, showing a third illustrative embodiment of a milling machine in accordance with the invention
  • FIGS. 8 and 9 are, respectively, an end elevation, in which the front gripping head has been omitted, and a top plan view, partly in section, showing fourth illustrative embodiment of a milling machine in accordance with the invention.
  • the invention is diagrammatically illustrated in the drawing.
  • Two gripping heads 2, 3 are mounted on a machine bed 1. At least one gripping head 3 is slidably mounted on longitudinal rails 4 carried by the machine bed 1.
  • the other gripping head 2 comprises a spindle sleeve 6, which is extensible by means of a hydraulic actuator 5 so that coordinated movements may be imparted to the gripping head 3 and the spindle sleeve 6, and the workpieces to be machined, which are gripped by the gripping heads 2 and 3, can be axially replaced. Said movements permit a replacement in the axial direction of the workpieces to be machined, which are gripped by the gripping heads 2 and 3.
  • a milling slide 8 is guided on transverse rails 7, which are carried by the machine bed 1 and extend normal to the axis of the workpiece.
  • That milling slide consists of a cross slide 9 having a guide column 9a and a vertically movable lifting slide 10, which surrounds the guide column 9a.
  • the cross slide 9 and the lifting slide 10 are displaceable independently of each other by respective power screws 9b, 10b. As a result, any desired feed movement in a plane which is normal to the axis of the workpiece can be performed by the milling slide 8.
  • the lifting slide 10 carries two freely protruding bearing brackets 11, which define a free space 12 between them.
  • Two milling units 13, which are coaxial to each other, are mounted in respective ones of the bearing brackets 11.
  • Each milling unit 13 consists of a tool drum 14, which is rotatably mounted in the bearing bracket 11, and an internally cutting, multiple inserted-tooth cutter 15. Rotation is imparted to both milling units 13 by a common motor 16 via transmission and synchronizing means, which are only diagrammatically indicated. In this manner all mainshaft portions and the end portions of a crankshaft having four crankpins can be machined at the same time.
  • the crankshaft is gripped at its ends by the gripping heads 2, 3 and is additionally supported by a back rest 17, which is disposed in the free space 12 between the two bearing brackets 11 and may be used to grip the crankshaft W between the two milling units 13.
  • the two bearing brackets 11 are axially forced toward each other against a spacer 18 in order to avoid vibrations so that a machining to a high accuracy can be performed.
  • the two milling units 13 are mounted on the common milling slide 8, they can be operated by uniform controlling and drive means, which act only in the directions of two coordinate axes. The machining times are very short because all mainshaft portions can be machined at the same time.
  • a milling slide may be provided with any of a plurality of bearing brackets for mounting different milling units. Regardless of the bearing brackets which are provided, the workpiece is always replaced in an axial direction. For a replacement of the inserted-tooth cutter, the milling slide must be retracted along the transverse rails until the inserted-tooth cutters are laterally accessible.
  • the milling machine shown in FIGS. 4 and 5 comprises a milling slide 8", which carries three bearing brackets 11" and 11a" for mounting three milling units 13".
  • the intermediate bearing bracket 11a' constitutes a mounting slide, which is vertically adjustable relative to the two other bearing brackets 11" by means of positioning drive 19.
  • the milling units 13" can be offset relative to each other and the crankpins of a crankshaft W 2 having four crankpins extending in a common plane can be machined at the same time.
  • the axis of the intermediate milling unit must be offset by twice the crank throw of the crankshaft from the axis of the two end milling units.
  • the intermediate bearing bracket 11a" is adjusted by means of the positioning drive 19.
  • crankshaft W 2 must be gripped in such a manner that the axes of the crankpins are vertically aligned.
  • two motors 16" are provided, one of which drives the intermediate milling unit 13" and is adjustable with the unit 13" and the other of which drives the end milling units 13".
  • Two back rests 17" for supporting the crankshaft W 2 are provided in the free spaces 12" left between the bearing bracket 11a" and the bearing brackets 11".
  • the milling machine shown in FIGS. 6 and 7 may be used to machine the crankpins of a crankshaft W 3 having four angularly spaced apart crankpins, two of which can be machined at the same time.
  • the milling slide 8"' carries a fixed bearing bracket 11"' and a bearing bracket 11a"', which constitutes a vertically displaceable mounting slide.
  • the crankshaft W 3 to be machined is gripped in such a manner that the axes of two crankpins are vertically aligned.
  • the two milling units 13"' are adjusted to a center spacing which is equal to the center spacing of said two crankpins.
  • the tool drum 14"' of each milling unit 13"' is provided only with a single inserted-tooth cutter 15"' and the center spacing of the two inserted-tooth cutters 15"' equals the center spacing of the two crankpins to be machined at the same time.
  • a uniform feed movement is imparted to the milling units 13"' by the milling slide.
  • the adjustment of the milling units 13"' can easily be accomplished because a separate motor 16"' is provided for each milling unit and is adjustable therewith.
  • a machining to a high finish is also ensured in this case by the provision of a back rest 17"' between the bearing brackets 11"', 11a"'.
  • the two bearing brackets are axially forced toward each other and against the spacer 18"'.
  • a milling slide 8"" is provided with two bearing brackets which constitute mounting slides 11"" that are axially displaceable along horizontal rails 20 and the axial spacing of said bearing brackets may be adjustable by means of a positioning drive 21.
  • Such a machine may be used to machine any desired crankshaft W 4 at a pair of corresponding crankpins at the same time without a need for adjusting the position of the milling slide 8"" or of the workpiece W 4 because the milling units 13"" can be adjusted by the adjustment of the bearing brackets 11a"".
  • a free space 12"" for accommodating a back rest 17"" is also left between the bearing brackets and the bearing brackets can easily be axially forced toward each other and against interposed spacers 18"" which are adjustable in length.
  • the milling machine in accordance with the invention is particularly suitable for the mass production of crankshafts and camshafts and is distinguished by an economical operation and by relatively low construction costs. Besides, it is highly versatile as regards the workpiece to be machined and the machining programs to be performed.
  • the bearing brackets constitute means which are provided on the milling slide and define between adjacent milling units a free space for receiving the back rest during the feed movement imparted to the milling units by the milling slide.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Turning (AREA)
  • Shovels (AREA)
US06/662,352 1983-11-15 1984-10-18 Milling machine Expired - Fee Related US4681491A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP83890211.2 1983-11-15
EP83890211A EP0142592B1 (de) 1983-11-15 1983-11-15 Fräsmaschine zur Bearbeitung von Kurbelwellen od. dgl.

Publications (1)

Publication Number Publication Date
US4681491A true US4681491A (en) 1987-07-21

Family

ID=8191645

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/662,352 Expired - Fee Related US4681491A (en) 1983-11-15 1984-10-18 Milling machine

Country Status (5)

Country Link
US (1) US4681491A (enrdf_load_stackoverflow)
EP (1) EP0142592B1 (enrdf_load_stackoverflow)
JP (1) JPS60123210A (enrdf_load_stackoverflow)
AT (1) ATE31647T1 (enrdf_load_stackoverflow)
DE (1) DE3375090D1 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5707187A (en) * 1995-06-07 1998-01-13 Ingersoll, Cm Systems, Inc. Crankshaft milling apparatus
US20100288072A1 (en) * 2001-07-31 2010-11-18 Immersion Corporation Control wheel with haptic feedback
CN103737082A (zh) * 2013-12-20 2014-04-23 柳州正菱集团有限公司 一种汽车载重后钢板弹簧吊环的粗铣两外圆端面工艺
CN106425578A (zh) * 2016-11-15 2017-02-22 天津华美永恒科技有限公司 一种立式铣床多功能组合夹具
CN118268634A (zh) * 2024-06-03 2024-07-02 安徽明途交通科技有限公司 一种中间球面板成型装置及其成型方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0189018B1 (de) * 1985-01-22 1988-10-05 GFM Gesellschaft für Fertigungstechnik und Maschinenbau Gesellschaft m.b.H. Fräsmaschine zum Bearbeiten von Kurbelwellen od. dgl.
JP2529100B2 (ja) * 1986-04-30 1996-08-28 株式会社小松製作所 クランクシヤフトミラ−
DE69205786T2 (de) * 1991-08-21 1996-03-28 Tokyo Seimitsu Co Ltd Blattpositiondetektionsvorrichtung.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110055A (en) * 1976-07-26 1978-08-29 Gfm Gesellschaft Fur Fertigungstechnik Und Maschinenbau Aktiengesellschaft Tool assembly and inserted-tooth cutter for milling cylindrical surfaces on a workpiece
US4208156A (en) * 1977-04-18 1980-06-17 Gfm Gesellschaft Fur Fertigungstechnik Und Maschinenbau Aktiengesellschaft Machine for machining crankpins of a multiple-throw crankshaft
US4326323A (en) * 1979-03-08 1982-04-27 Gfm Gesellschaft Fur Fertigungstechnik Und Maschinenbau Gesellschaft M.B.H. Crankshaft milling machine
US4337011A (en) * 1979-04-18 1982-06-29 Gebrueder Heller, Maschinenfabrik Gmbh Crankshaft milling machine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650522A (en) * 1946-10-21 1953-09-01 Gisholt Machine Co Turn milling machine
FR2188467A5 (enrdf_load_stackoverflow) * 1972-06-09 1974-01-18 Renault
DE2836383C2 (de) * 1978-08-19 1980-08-28 Gebr. Heller Maschinenfabrik Gmbh, 7440 Nuertingen Kurbelwellenfräsmaschine
JPS5852761B2 (ja) * 1979-03-30 1983-11-25 株式会社小松製作所 クランクシヤフト加工機械
DE3117030A1 (de) * 1981-04-29 1982-11-18 Gebrüder Boehringer GmbH, 7320 Göppingen Wirbelmaschine zur bearbeitung von kurbelwellen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110055A (en) * 1976-07-26 1978-08-29 Gfm Gesellschaft Fur Fertigungstechnik Und Maschinenbau Aktiengesellschaft Tool assembly and inserted-tooth cutter for milling cylindrical surfaces on a workpiece
US4208156A (en) * 1977-04-18 1980-06-17 Gfm Gesellschaft Fur Fertigungstechnik Und Maschinenbau Aktiengesellschaft Machine for machining crankpins of a multiple-throw crankshaft
US4326323A (en) * 1979-03-08 1982-04-27 Gfm Gesellschaft Fur Fertigungstechnik Und Maschinenbau Gesellschaft M.B.H. Crankshaft milling machine
US4337011A (en) * 1979-04-18 1982-06-29 Gebrueder Heller, Maschinenfabrik Gmbh Crankshaft milling machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5707187A (en) * 1995-06-07 1998-01-13 Ingersoll, Cm Systems, Inc. Crankshaft milling apparatus
US20100288072A1 (en) * 2001-07-31 2010-11-18 Immersion Corporation Control wheel with haptic feedback
CN103737082A (zh) * 2013-12-20 2014-04-23 柳州正菱集团有限公司 一种汽车载重后钢板弹簧吊环的粗铣两外圆端面工艺
CN106425578A (zh) * 2016-11-15 2017-02-22 天津华美永恒科技有限公司 一种立式铣床多功能组合夹具
CN118268634A (zh) * 2024-06-03 2024-07-02 安徽明途交通科技有限公司 一种中间球面板成型装置及其成型方法

Also Published As

Publication number Publication date
DE3375090D1 (en) 1988-02-11
ATE31647T1 (de) 1988-01-15
EP0142592A1 (de) 1985-05-29
JPS6365448B2 (enrdf_load_stackoverflow) 1988-12-15
EP0142592B1 (de) 1988-01-07
JPS60123210A (ja) 1985-07-01

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